Add more components_unittests to GN build

components/network_hints/renderer/BUILD.gn

Index: components/network_hints/renderer/BUILD.gn
diff --git a/components/network_hints/renderer/BUILD.gn b/components/network_hints/renderer/BUILD.gn
index 48f52cd14c4873926163e4be8891b2ae7025d21c..8ddd2abad4487b93514aac0142e4f73d647e1f19 100644
--- a/components/network_hints/renderer/BUILD.gn
+++ b/components/network_hints/renderer/BUILD.gn
@@ -21,3 +21,15 @@ source_set("renderer") {
     "//third_party/WebKit/public:blink",
   ]
 }
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "dns_prefetch_queue_unittest.cc",
+    "renderer_dns_prefetch_unittest.cc",
+  ]
+  deps = [
+    ":renderer",
+    "//testing/gtest",
+  ]
+}